[转] 关于 Ceph PG

本系列文章会深入研究 Ceph 以及 Ceph 和 OpenStack 的集成:

Placement Group, PG

How PGs are Used?

Should OSD#2 fail

Data Durability Issue

Object Distribution Issue

Choosing the number of PGs

Example

如何根據現狀調整 PG and PGP?

Monitoring OSDs

Ceph is NOT Healthy_OK

OSD Status Check

PG Sets

When A OSD in the Acting Set is down

Up Set

Check PG Status

Point

Peering

Peering: Establish Agreement of the PG status

Monitoring PG States

Check PG Stat

List Pool

PG IDs

The Output Format of the placement group

 PG
Creating PG

Create A Pool

 Peering
A Peering Process for a Pool with Replica 3

Active

Clean

DEGRADED

PG with {active + degraded}

Recovering

Backing Filling (1/2)

Backing Filling (2/2)

Remapped

 Stale
Identifying Troubled PGs (1/2)

Identify Trouble PGs (2/2)

Finding An Object Location